For some reason my insta kill and x2 shaders look really bad and stretched out, im using the black ops 2 ones and ive exported and converted them all the same but compared to the firesale they look really crappy, does anyone know why or how I can fix this?

Well it seems you are using the transit versions of the insta kill and double points, while also using fire sale from one of the dlc maps. I would recommend using all dlc shaders to make them look consistent - Treyarch redid all shaders in the dlc maps to make them higher resolution.